linux_aura: Implement most of DesktopScreenX11.

chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc

Index: chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc
diff --git a/chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc b/chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc
index 328b5702aa2aa47e27d7004bdcabd8fd5f676f9e..a63ebce3c490bbd109481c24ef43a0011bf3fc15 100644
--- a/chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc
+++ b/chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc
@@ -52,12 +52,7 @@ void ChromeBrowserMainExtraPartsAura::ToolkitInitialized() {
 #if !defined(OS_CHROMEOS)
 #if defined(USE_ASH)
   active_desktop_monitor_.reset(new ActiveDesktopMonitor(GetInitialDesktop()));
-  if (!chrome::ShouldOpenAshOnStartup())
 #endif
-  {
-    gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE,
-                                   views::CreateDesktopScreen());
-  }
 #endif
 
 #if !defined(USE_ASH) && defined(OS_LINUX) && defined(USE_X11)
@@ -66,6 +61,18 @@ void ChromeBrowserMainExtraPartsAura::ToolkitInitialized() {
 #endif
 }
 
+void ChromeBrowserMainExtraPartsAura::PostMainMessageLoopStart() {
+#if !defined(OS_CHROMEOS)
+#if defined(USE_ASH)
+  if (!chrome::ShouldOpenAshOnStartup())
+#endif
+  {
+    gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE,
+                                   views::CreateDesktopScreen());
+  }
+#endif
+}
+
 void ChromeBrowserMainExtraPartsAura::PostMainMessageLoopRun() {
   active_desktop_monitor_.reset();